Treating sugar liquors.



UNITED scrirrris I. PATENT OFFICE.

FAUSTIN I-ILAVATI, F BERLIN, GERMANY.

TREATING- SUG-AR LIQUORS.

1,054,414. No Drawing.

To all whom it may concern:

Be it known that I, FAUSTIN IIL.-\\-'AT1, a subject to the Emperorof Aust1-iaHungary, residing at Berlin, Germany, have invented 5 certain new and useful Improvements in Treating Sugar Liquors, of which the following is a specification In prior patents I have described a process for purifying sugar liquors in which to the juice coming from the ditt'users certain sulfates,preferably ferrous sulfate are added and the juice after the ordinary operations of chalking and saturating is treated with sulfids, for instance calcium sultid in order to completely separate the iron compounds which are in an extraordinary manner fast boundto the organic non sugar substances of ttie solution. This process involves certain difliculties partially resulting even from Zoo its advantages. The juices n'oduced by this process are extraordinarily pure and therefore a snow-white product is obtained, but as the juices are excellently clear the heat of the heating devices which are in sugar manufacture exclusively heated by diroot or indirect steam is most easily transferred tothe juice and therefore the easier produces the decomposition of the sugar which is well known as the so-called cara; melization. Furtl'ierniore, by adding sulfates the alkali. salts contained in the raw juice are transformed to sulfates which alkali sulfates seem to have the strange propcrty of likewise facilitating caramelization. Therefore I was obliged to take good care in further improving the process in such a manner that the said injurious caramelization would besurely avoided without, dis turbing the reactions upon which the suc- 40 cess of the process depends. I was surprised to find that the separation of the iron compounds by sulfids can be etlected at considerably lower temperatures than-it has been generally believed heretofore.

Therefore my invention consists in that ,the ten'iperatlu'c is no more increased up to the moment in which calcium sultid or the like is added, and the calcium sulfid is added at a temperature below 75 centigrade, pref- Specification of Letters Patent.

Application filed January 30, 1912. Serial No. 674,314.

Patented Feb. 25, 1913.

erably at 45 to But also during the followingoperations it must be possibly avoided to increase the temperature, especiall durmg the evaporation to thick-juice. n this operation care must be taken that the heating devices never attain a temperature of 100 and that the proportions of the apparatus and the circulation of the juice are regulated in such a manner that the juice does not attain on an average higher temperatures than of 50 to 60 f It may be of advantage to add to the juice a certain quantity of zinc (lust after the calcium sulfid has been added. By the addition of zinc dust the apparatus is protected against the nascent sulfurated hydrogen, an excess of alkali is neutralized and the malodorous sulfureted hydrogen is absorbed.

I claim 1. The process of purifying sugar liquors which consists in adding metallic sulfates to the juices from the diffusers, heating the said juices to temperatures below 75 C., adding a sultid or sulfids at temperatures below 75 C., and evaporating in such a manner that the heating devices do not attain a temperature of 100 C.

2. The process of purifying sugar liquors which consists in adding metallic sulfates to the said liquors, heating the said liquors to temperatures below 75 C., adding a sulfid or sulfids at temperatures below 75 C., adding zinc dust, filtering olt', and eva crating the solution in such a manner that t e heating devices do not attain a temperature of 100 C.

3. The process of purifying diffusion juices of sugar, which consists in addin metal sulfates and then chalk to the sai juices to produce compounds of metals and non-sugar substances,-and then treating the juices with a sulfid or sulfids at temperatures below 75 centigrade, in orderto decompose the said metallic compounds and to separate the said metal and the said nonsugar substances at the same t me.

t. The process of purify1ng d1fi1lS l0n juices of sugar, which consists in adding ferrous sulfate and then chalk to the said juices with a sulfid or suifids at temperature In testimony whereof I afiix my signature in presence oftwo Witnesses.

FAUSTIN HLAVATI.

juices to produce compounds of iron and non-sugar substances, and then treatlng the \Vitnesses:

HENRY HAsPER. VOLDEMAR H AUPT. 

